ISO 16934:2007 建物内のガラス—防爆セキュリティグレージング—衝撃波管荷重によるテストと分類 | ページ 6

3.1

air-blast pressure history

3.2

ambient temperature

air temperature around the test specimen measured within 30 min of the test

3.3

attack face

face of the test specimen intended to face the explosion source

3.4

blast shock wave

test pressure wave impinging on the attack face of the test specimen (defined in the terms below)

Note 1 to entry: The pressure recorded and referred to shall be the peak positive pressure experienced by the test specimen positioned at the end of the shock tube. This is typically a reflected pressure.

3.5

breach

any perforation or opening through the test specimen or between the test specimen and the support frame, evident after the test, through which a 10 mm diameter rigid bar can be gently passed without force

Note 1 to entry: An opening may be caused by the glazing sheet in-fill pulling away from the rebate sufficiently to result in a visible gap that exposes the edge of the sheet.

3.6

cartridge paper

thick white paper for pencil and ink drawings, typically about 130 g/m²

3.7

fragment

any particle with a united dimension of 25 mm (1 in) or greater as defined in Clause 8

Note 1 to entry: The united dimension of a glass particle is determined by adding its width, length and thickness. Glazing dust, slivers and all other smaller particles are not accounted as fragments.

3.8

fragment collecting mat or surface

clean, smooth surface at nominal floor level in the protected area suitable for observing and collecting ejected fragments

Note 1 to entry: It shall extend over an area of width and of depth from the rear face to the witness panel as defined for a witness area in Clause 6 at a level at least 0,5 m but not exceeding 1,0 m below the bottom edge of the test specimen when that is representative of a typical window. The level of the mat may be adjusted to correspond with the intended level of floor in relation to the position of a non-standard test specimen in the building as defined in Clause 8.

3.9

glazing

glass or plastics glazing sheet material, including glass/plastic combinations

Note 1 to entry: Glazing may also refer to a fenestration assembly in which glass or plastic sheet infill is set in and is complete with a framing system for installation into a building.

3.10

impulse

I_pos

area under the positive phase of the pressure-time trace

Note 1 to entry: This is usually obtained by automatic electronic numerical integration of the gauge readings. This is also sometimes called the specific positive phase impulse. If sharp irregularities in the recorded trace result in non-representative transient dips into negative pressure or the negative phase is absent, the positive phase impulse should be calculated over the period of the mean pressure-time trace duration.

Note 2 to entry: Different subscripts may be used for the blast parameters, as described in Annex A. For example, the positive phase impulse, I_pos, may be denoted I_c where it denotes the classification impulse or I_t where it denotes the impulse calculated from the measured test values.

3.11

peak pressure

P_max

initial peak positive reflected pressure above ambient atmospheric pressure experienced at the attack surface of the test specimen following an instantaneous rise at the time of arrival of the shock front

Note 1 to entry: If the measured pressure-time trace has sharp spikes or irregularities, the trace should be smoothed to produce a pressure-time trace that closely matches the mean path of the recorded trace. The peak pressure, P_max, of relevance is the resulting smoothed value at the time of arrival.

3.12

positive phase duration

t_pos

duration of the positive phase of the mean pressure-time trace

Note 1 to entry: The mean pressure-time trace should have positive phase duration, waveform and peak pressure such that the area under this curve equals the positive phase impulse obtained by direct integration of the original recorded trace. The duration can normally be derived by reference to the time of the peak of the impulse-time curve.

3.13

pressure-time wave trace

pressure values plotted against time

Note 1 to entry: The instantaneous rise at the shock front to the peak positive pressure, P_max, is followed by a non-linear decay to ambient pressure over a time called the positive phase duration. The shape of the decay curve may be modelled by an exponential decay curve having a decay coefficient, A , also known as a waveform parameter. In a free-field blast, a period of negative pressure then follows for a period of time before returning to ambient. Within the confines of a shock tube, this period of negative pressure is sometimes absent or reduced in value.

3.14

protected area

area on the side of the test specimen away from the source of the shock wave

3.15

rear face

protected area side of the test specimen opposite to the attack face

3.16

reflected pressure

pressure experienced by a surface which obstructs the flow of a blast wave

Note 1 to entry: The shock wave moving through the air impacts the test specimen and is “reflected”, producing a pressure on the surface having a value higher than would have occurred within an unobstructed flow or on the side of a target parallel to the direction of travel of the pressure wave.

3.17

test specimen

sample of glazing submitted for test

3.18

witness panel

panel of deformable material positioned behind the test specimen in order to register the incidence of material forcibly detached from the test specimen during test

Note 1 to entry: The composition and location of the witness panel is described in Clause 6.

3.19

witness panel perforations

any holes in the surface of the witness panel caused by impact of any material as a result of the blast

Note 1 to entry: The number, size and depth of penetration of such perforations can be used as a guide to the injury potential of material detached from the test specimen.

3.20

witness panel indents

any detectable deformation of the surface of the witness panel caused by impact of any material as a result of the blast